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COSWEET
A combined absorption catalytic conversion process for complete COS destruction developed by IFPEN. By combining amine absorption with catalytic COS hydrolysis, COSWEET™ allows gas sweetening, either total (removal of both H₂S & CO₂) or selective (removal of H₂S mainly), with complete COS removal. COSWEET™ is applicable with any type of absorption solvent.
Process Principle
- Removing the bulk of the H₂S and CO₂ present in the feed gas by absorption in the bottom section of a solvent absorber.
- Withdrawing the partially sweetened gas from bottom section of the absorber, water washing, heating to mild temperature and sending it to a hydrolysis reactor, where COS is converted to H₂S and CO₂.
- Cooling the hydrolyzed gas and removing the H₂S (and if needed also the CO₂) by absorption in the top part of the amine absorber, down to the required specification
Process Scheme
Performances
Key Benefits
- COS destruction integrated with amine sweetening
- Very active catalyst destroys COS down to the ppm level at moderate temperature
- Low pressure drop and moderate energy consumption
- Used with any amine solution
- With MDEAmax: complete COS removal
- No impact on H2S / CO2 selectivity
- No impact on Sulphur Recovery Units
- With HiLoadDEA / energizedMDEA: COS destruction boosted at reduced cost
- Economics:
- CAPEX: -15%
- OPEX: -20%
- Compared with alternative COS removal options
A process developed by IFP Energies nouvelles.
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